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toggle CHANGES the name of the class ("firstColor") to another name ("secondColor").
tdObj.classList.toggle("secondColor") gives the td a class of secondColor if it doesn't already have one, and removes it if it's there. It doesn't have any effect on other classes, such as firstColor.
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tdObj.classList.toggle("secondColor")gives thetda class ofsecondColorif it doesn't already have one, and removes it if it's there. It doesn't have any effect on other classes, such asfirstColor.